Cannot use derivative in batch queries because the query does not validate correctly

Nobody has claimed this yet.

When I try to use non_negative_derivative in a batch query I get an error that I need to specify the group by interval even though it looks to me like I did. Here's my TICK script:

```
var read_stats = batch
|query('''SELECT non_negative_derivative(last("bytes"), 1s) as
bytes FROM "gpfs"."default"."read_stats" where fs = 'dmd' ''')
.period(10s)
.every(10s)
.groupBy(time(10s), *)

read_stats | httpOut('read_stats')
```

Here's the error:

```
non_negative_derivative aggregate requires a GROUP BY interval.
```

I'm using Kapacitor and InfluxDB 0.13.

Start by reproducing the TICK batch query shown in the issue with Kapacitor and InfluxDB 0.13, then trace the query validation for non_negative_derivative and the GROUP BY interval. Done means the query validates and runs without incorrectly reporting that a GROUP BY interval is missing.

Written by the indexing model from the issue text.